package car.filter;

import com.alibaba.fastjson.JSON;
import dhu.com.car.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

        //获取URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);

        //本次请求是否需要处理
        String[] urls=new String[]{
                "/user/login",
                "/user/logout",
                "/user/save",
                "/backend/**",
                "/client/**",
        };
        boolean check=check(urls,requestURI);
        //不需要处理直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //判断员工登录状态，已登录放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录：，用户id为：{}",request.getSession().getAttribute("employee"));


            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //未登录返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for(String url:urls){
            boolean match= PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }

}
